117 lines
3.0 KiB
Go
117 lines
3.0 KiB
Go
// Copyright © 2017 The virtual-kubelet authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package root
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import (
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"context"
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"net"
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"net/http"
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"os"
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"strconv"
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"strings"
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"time"
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"github.com/pkg/errors"
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"github.com/virtual-kubelet/virtual-kubelet/errdefs"
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"github.com/virtual-kubelet/virtual-kubelet/log"
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octrace "go.opencensus.io/trace"
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"go.opencensus.io/zpages"
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)
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var (
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reservedTagNames = map[string]bool{
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"operatingSystem": true,
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"provider": true,
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"nodeName": true,
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}
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)
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func setupTracing(ctx context.Context, c Opts) error {
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for k := range c.TraceConfig.Tags {
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if reservedTagNames[k] {
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return errdefs.InvalidInputf("invalid trace tag %q, must not use a reserved tag key", k)
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}
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}
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if c.TraceConfig.Tags == nil {
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c.TraceConfig.Tags = make(map[string]string, 3)
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}
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c.TraceConfig.Tags["operatingSystem"] = c.OperatingSystem
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c.TraceConfig.Tags["provider"] = c.Provider
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c.TraceConfig.Tags["nodeName"] = c.NodeName
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for _, e := range c.TraceExporters {
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if e == "zpages" {
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setupZpages(ctx)
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continue
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}
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exporter, err := GetTracingExporter(e, c.TraceConfig)
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if err != nil {
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return err
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}
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octrace.RegisterExporter(exporter)
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}
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if len(c.TraceExporters) > 0 {
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var s octrace.Sampler
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switch strings.ToLower(c.TraceSampleRate) {
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case "":
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case "always":
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s = octrace.AlwaysSample()
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case "never":
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s = octrace.NeverSample()
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default:
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rate, err := strconv.Atoi(c.TraceSampleRate)
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if err != nil {
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return errdefs.AsInvalidInput(errors.Wrap(err, "unsupported trace sample rate"))
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}
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if rate < 0 || rate > 100 {
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return errdefs.AsInvalidInput(errors.Wrap(err, "trace sample rate must be between 0 and 100"))
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}
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s = octrace.ProbabilitySampler(float64(rate) / 100)
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}
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if s != nil {
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octrace.ApplyConfig(
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octrace.Config{
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DefaultSampler: s,
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},
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)
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}
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}
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return nil
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}
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func setupZpages(ctx context.Context) {
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p := os.Getenv("ZPAGES_PORT")
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if p == "" {
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log.G(ctx).Error("Missing ZPAGES_PORT env var, cannot setup zpages endpoint")
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}
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listener, err := net.Listen("tcp", p)
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if err != nil {
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log.G(ctx).WithError(err).Error("Cannot bind to ZPAGES PORT, cannot setup listener")
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return
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}
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mux := http.NewServeMux()
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zpages.Handle(mux, "/debug")
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go func() {
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// This should never terminate, if it does, it will always terminate with an error
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srv := &http.Server{Handler: mux, ReadHeaderTimeout: 30 * time.Second}
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e := srv.Serve(listener)
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if e == http.ErrServerClosed {
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return
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}
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log.G(ctx).WithError(e).Error("Zpages server exited")
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}()
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}
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